How to edit squid proxy settings in Internet Explorer
Go to Tools> Internet Options
New window will appear, click on Connections > LAN Settings
Local Area Network (LAN) Settings window will appear.
On Proxy server, click “Use a proxy server for your LAN”.
Enter the IP in Address field. Enter 3128 in Port field. Click “Advanced”.
Enter the IP in HTTP Proxy field. Enter 3128 in Port field.
Check “use the same proxy server for all protocols”. This is how your proxy settings should look lik
Click Ok.
If it doesn’t work, some ISP block port 3128. So try port 52931 instead.
Source: http://squidproxies.com
Read more:
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How to edit private proxy settings in Firefox for Anonymous surf